AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in April 2026 (see full year).
Return flights
| 07 Apr - 14 Apr | Finnair | ||
| 24 Apr - 29 Apr | British Airways | ||
| 17 Apr - 28 Apr | KLM | ||
| 04 Apr - 19 Apr | British Airways | ||
| 05 Apr - 18 Apr | British Airways | ||
| 03 Apr - 07 Apr | British Airways |
Also check the deals for one-way flights from Portland to Lisbon in April.
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